San Francisco Supervisor David Campos on Tuesday will introduce legislation to overhaul the city’s universal health care program in an attempt to ensure that people who can’t afford insurance on the state exchange can remain in the low-cost program and that employers cannot reclaim employees’ unspent health care funds.

The city’s Healthy San Francisco program, created in 2007 as the first of its kind in the country, is not considered insurance because it doesn’t cover participants when they travel outside city borders.